Osram HQI-E 150 W/NDL CL Technical Information download pdf (Page 25)

2

5

ing the course o

f

the service li

f

e. Lamps o

f

di

ff

ering

g

eometries and

f

illin

g

also show di

ff

erent resonance

f

requencies. A reduction in watta

g

e also chan

g

es the

resonance

f

requencies due to the chan

g

e in plasma

tem

p

erature

.

5.

3

R

ecommen

d

at

i

ons

f

or re

d

uc

i

ng t

h

e wattage

i

n

di

sc

h

ar

g

e

l

amp

s

5.

3

.1

M

eta

l

h

a

lid

e

l

am

p

s

:

Basicall

y

it is possible to dim P

O

WERBALL H

C

I

®

.

W

hile the hi

g

her thermal load capacity o

f

the round

ceram

i

c arc tu

b

e perm

i

ts an

i

mprove

d

di

mm

i

n

g

b

e

h

av-

iour in terms o

f

luminous e

ff

icacy and colour renderin

g

com

p

are

d

to meta

l

h

a

lid

e

l

am

p

s w

i

t

h

q

uartz arc tu

b

e

or w

i

t

h

t

h

e norma

l

cy

li

n

d

r

i

ca

l

ceram

i

c tu

b

e,

di

mm

i

n

g

still causes a shi

f

t in the chromaticit

y

coordinate.

Di

mme

d

l

amps s

h

ow a

g

reater

d

rop

i

n

ligh

t output an

d

wider colour spread throu

g

hout the service li

f

e.

It is important to avoid these e

ff

ects

f

or interior li

g

ht

-

ing. They are more apparent when operated on con

-

vent

i

ona

l

contro

l

g

ear t

h

an on e

l

ectron

i

c contro

l

g

ear.

OS

RAM therefore recommends not to reduce powe

r

w

i

t

h

current

ly

ava

il

a

bl

e

l

amps on convent

i

ona

l

contro

l

g

ear or

f

or indoor li

g

htin

g

.

The type o

f

dimming has a great impact on the results.

I

t

i

s recommen

d

e

d

to use on

ly

a

dj

usta

bl

e

El

ectron

i

c

b

a

ll

asts w

i

t

h

squarewave operat

i

on an

d

to comp

l

ete

ly

avo

id

di

mm

i

n

g

v

i

a re

d

uc

i

n

g

t

h

e supp

l

y vo

l

ta

g

e o

r

l

ea

di

n

g

-e

dg

e or tra

ili

n

g

-e

dg

e p

h

ase

di

mmers.

I

t

i

s not

possible to

g

uarantee that dimmed lamps will be able

to meet t

h

e

p

ro

d

uct

p

ro

p

ert

i

es

.

In an

y

case, the lamp should run

f

or at least 15 minutes

with 100

%

watta

g

e a

f

ter bein

g

switchin

g

on so that

t

h

e

l

amp can

ligh

t up correct

l

y

.

A

warranty regarding lifetime can only be given

w

hen a

pp

roved POWERBALL HCI

®

units

(

cf. online

catalo

g

ue

)

on the P

O

WERTR

O

NI

C

®

PTo

a

r

e

di

mm

ed.

Op

eration of P

O

WERBALL H

CI

®

o

n t

he

P

O

WERTR

O

NI

C

®

PT

o:

The combination of P

O

WERBALL H

CI

®

a

n

d

P

O

WERTR

O

NI

C

®

PT

o a

ll

ows ener

g

y-sav

i

n

g

operat

i

on

everyw

h

ere w

h

ere opt

i

m

i

se

d

co

l

our ren

d

er

i

n

g

i

s not

important,

f

or example outdoor li

g

htin

g

.

Th

e

PT

o w

i

t

h

squarewave operat

i

on an

d

opt

i

m

i

se

d

i

g

-

n

ition runs the P

O

WERBALL H

CI

®

l

amps

id

ea

lly

d

own

to 60% of the lamp output

(

rated value

)

. No si

g

nificant

n

e

g

ative e

ff

ects arise even when the output is reduced

to 85

%

o

f

the rated out

p

ut.

Even when o

p

erated at between 85

%

and 60

%

o

f

the

rated output, this does not ne

g

atively e

ff

ect the

f

ailure

rate.

H

owever,

i

ncreas

i

n

gl

y t

h

e

l

amps

h

ave a s

ligh

t

l

y

g

reen touch and the colours may deviate

f

rom each

o

ther

(

colour s

p

read

)

.

T

he luminous

f

lux drops sli

g

htly more throu

g

hout the

service li

f

e in dimmin

g

mode than when operated at

100

%

on the PTo. This e

ff

ect can be reduced i

f

the

lamps are operated via a combination o

f

dimmin

g

and

100

%

o

p

eration

.

5.

3

.

2

Di

mm

i

n

g

o

f

ot

h

er

di

sc

h

ar

g

e

l

amps

High

pressure mercury

l

amps:

T

hese lam

p

s can be dimmed to 50

%

o

f

the rated

wattage, whereby they must be started up with 100

%

watta

g

e.

Di

mm

i

n

g

i

s poss

ibl

e

b

y vo

l

ta

g

e re

d

uct

i

on,

p

h

ase contro

l

an

d

amp

li

tu

d

e mo

d

u

l

at

i

on.

High

pressure so

di

um

l

amps:

It is

p

ossible and allowed to reduce the

p

ower o

f

all

V

IAL

O

X

®

NAV

®

down to 50

%

o

f

the lam

p

s rated values

without im

p

act on the service li

f

e

• v

i

a step sw

i

tc

hi

n

g

b

y c

h

an

gi

n

g

to

i

n

d

uct

i

ve

contro

l

g

ear w

i

t

h

t

h

e next

l

ower rat

i

n

g

o

r

• via step switchin

g

with additional inductance,

whereb

y

in both cases electronic power switches must

be

used.

Wh

en re

d

uc

i

n

g

t

h

e power, ensure t

h

at t

h

e

l

amps are

started and o

p

erated at their rated values

f

or a

pp

rox.

10 minutes be

f

ore dimmin

g.

I

t

i

s not perm

i

tte

d

to re

d

uce t

h

e power

b

y

l

ea

di

n

g

edg

e p

h

ase contro

l

or re

d

uc

i

n

g

t

h

e ma

i

ns vo

l

ta

g

e

.

OS

RAM recommends the electronic ballast

P

O

WERTR

O

NI

C

®

PTo for dimmin

g

operation.

Dimmin

g

causes a reduction in li

g

ht output and

colour chan

g

e.

Sq

uarewave o

p

eration is recommended for

di

mm

i

n

g

.

F

or out

d

oor

ligh

t

i

n

g

: opt

i

m

i

se

d

operat

i

on

of the a

pp

roved P

O

WERBALL H

CI

®

o

n th

e

P

O

WERTR

O

NI

C

®

PT

o

.

There is no warrant

y

for dimmed P

O

WERBALL

H

CI

®

.

A

warranty re

g

ar

di

n

g

lif

et

i

me can on

l

y

be

g

iven when approved P

O

WERBALL H

C

I

®

units

(

cf. online catalo

g

ue

)

are dimmed on the

P

O

WERTR

O

NI

C

®

PTo

.

Op

eration of

OS

RAM P

O

WER

S

TAR H

CI

®

(

c

y

lindri

-

cal burner

)

and

OS

RAM H

QI

®

l

amps w

i

t

h

re

d

uce

d

p

ower is not

p

ermitted as this can cause consider-

a

bl

e co

l

our

d

ev

i

at

i

ons, muc

h

p

oorer

l

um

i

nous

fl

ux

ma

i

ntenance an

d

s

h

orter serv

i

ce

li

ves

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